What is this problem?

I think I have a def but not sure. This is starting from the bottom of a black water plant and a blue dream.
I am in pro mix hp. Ph to 5.9-6.1 last feeding was 4ml per gal in 1-1-1 ratio of GH m/g/b. I also added cal mag, protekt, this last feeding 2 days ago. Temps are 75-80 day and 65 night.

added a few new pictures. I am only watering like every 4th day or so. Media should dry out between watering a correct? Maybe I am not feeding/watering enough??

I had same proplem but I was told its normal for bottom leaves to die the older the plant get but just me.. Ph is lil low I go with 6.0 and up

They aren't that old. Just started 12/12 today.

if its only a few pick them off. a pic of the entire plant is more helpfull

if the fingers are pointed down at the end is that related to nitrogen? causing nute lock and causing other deficincies the yellowing i used urea on an outdoor plant and this is what the leaf looked like im not experienced but through causing this problem with pure nitrogen and a bit of reading i would think thats what that problem is i flushed for a week and used nice light balanced nutes all rounder mg for tomatoes and vegs and there lushes now i waited for new growth before pulling leaves but all of my leaves were burnt please correct me if im wrong as i love learning

1st problem i see is , its off the plant. Leave them on and let the plant feed off them.

I have had N issues , that doesnt look like it to me.

Hilo said:

1st problem i see is , its off the plant. Leave them on and let the plant feed off them.

I have had N issues , that doesnt look like it to me.

Click to expand...

the leaves are a pretty deep green does changing lights to 12/12 create a higher need for potassium and phosphate and just changing to flower would still have build up of nitrogen from veg assuming in soil just a shot in the dark the tops of my plants[new shoots] also went a light green nearly looked like a crown starting a sick oneit might be another problem but probably caused from build of nitrogen from veg i can post pics of mine when this was happening from the urea problem and compare to yours when i get the chance as i said before just trying to learn so it dont happen again peace

Added some additional pics. Any other thoughts??

Ph is to low and plants don't like it. Or ppm too high. Maybe strain isn't big feeder

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Feed with molasses and cal/mag and they look happy with it. Hope the problem doesn't get worse.

I would not be overly concerned with this at this point. It is fairly normal to have low fan leaves start to deteriorate a little as flowering starts.

I cant see shit in your light..... Take pics with regular light so we can see the color.